Overview
The LA2232 and LA2232M are RDS demodulator ICs
that provide both a 57 kHz bandpass filter as well as ARI-
SK and DK signal recognition functions on chip. Cost-
effective RDS decoder systems can be constructed by
using an LA2232 or 2232M in conjunction with a
synchronization and error detection/correction LSI from
the LC7070 series. The LA2232 and 2232M provide
improved sensitivity LA2230 and 2230M.
Applications
RDS signal demodulation
ARI signal demodulation and SK and DK recognition
Functions
57 kHz bandpass filter
RDS signal demodulation
Bit rate clock regeneration
RDS identification output
ARI signal demodulation
SK identification output
DK identification output
Adjustable ARI detection sensitivity
Features
High RDS demodulation sensitivity
Reduced costs and PCB area due to the inclusion of an
on-chip 57 kHz bandpass filter
Supports improved interference rejection characteristics
by providing ARI detection sensitivity adjustment
Quick operation startup due to a built-in rapid charging
circuit for use at power application.
Package Dimensions
unit: mm
3067-DIP24S
unit: mm
3112-MFP24S
Ordering number : EN4416A
21097HA(OT) No. 4416-1/9
SANYO: DIP24S
[LA2232]
SANYO: MFP24S
[LA2232M]
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
RDS Decorder
LA2232, 2232M
Monolithic Linear IC
No. 4416A-2/9
LA2232, 2232M
Specifications
Maximum Ratings
at Ta = 25C
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
V
CC
max
Pins 13, 14, 15, 23
12
V
LA2232:
Ta
80C
450
mW
Allowable power dissipation
Pd max
LA2232M:
Ta
37.5C
450
mW
LA2232M:
Ta = 80C
280
mW
Entering current
I
LED
Pins 13, 14, 15
20
mA
Operating temperature
Topr
30 to +80
C
Storage temperature
Tstg
LA2232
40 to +125
C
LA2232M
40 to +150
C
Operating Conditions
at Ta = 25C
Parameter
Symbol
Conditions
Ratings
Unit
Recommended supply voltage
V
CC
Pin 23
5.0
V
Operating voltage range
V
CC
op
Pin 23
4.7 to 5.5
V
Operating Characteristics
at Ta = 25C, V
CC
= 5.0 V
Ratings
Parameter
Symbol
min
typ
max
Unit
Quiescent current
14
22
28
mA
Band pass filter gain
f = 57 kHz
9
12.5
17
dB
f = 60 kHz (57 kHz = 0 dB)
6
2.5
0
dB
Band pass filter selectivity
f = 54 kHz (57 kHz = 0 dB)
6
3.5
0
dB
f = 38 kHz (57 kHz = 0 dB)
39
33
dB
PLL capture range
5 mVrms CW input
0.5
%
+0.8
%
RDS detection sensitivity
The pin 6 input when pin 15 goes low
0.4
1.0
mVrms
SK detection sensitivity
The pin 6 input when pin 14 goes low
1.0
2.0
mVrms
DK detection sensitivity
The pin 6 input when pin 13 goes low
1.1
2.0
mVrms
The maximum input on pin 6 for the (ARI + RDS)
30
50
mVrms
RDS
signal when pin 15 goes low
Input dynamic range
The maximum input on pin 6 for the RDS signal
250
mVrms
when pin 15 goes low
DK
The maximum input on pin 6 for the ARI signal
75
100
mVrms
when pin 15 goes low
Bit rate clock jitter
8
9
10
s
RDS lockup time
The time until pin 15 goes low following RDS
35
ms
becoming a 3 mV input
SK lockup time
The time until pin 14 goes low following ARI
45
ms
becoming an 8 mV input
SK + RDS lockup time
The time until pin 15 goes low following RDS +
80
ms
ARI becoming an 8.5 mV input
Data output
The high level for pin 17
4.7
4.9
5.0
V
The low level for pin 17
0
0.1
0.3
V
Bit rate clock output
The high level for pin 18
4.7
4.9
5.0
V
The low level for pin 18
0
0.1
0.3
V
VCO free-running frequency
453
456
459
kHz
Equivalent Circuit Block Diagram
Test Circuit
No. 4416A-3/9
LA2232, 2232M
*R = 6.8 k
(for the LA2232)
R = 5.6 k
(for the LA2232M
Unit (resistance:
, capacitance: F)
Sample Application Circuit Using the LA2232/M and the LC7073/M
Adjusting the 57 kHz BPF
(A) Check the output level of the bi-phase signal from pin 4 or pin 22 (with the pin 6 RDS input at about 1 mVr ms and the ALC circuit not operating).
(B) Check the signal level of the BPF checkpoint (with the pin 6 RDS input in the range 3 to 6 mVr ms or higher).
No. 4416A-4/9
LA2232, 2232M
3 to 6 mVr ms
Recommended input signal level
(when RDS
f = 2.0 kHz)
*R = 6.8 k
(for the LA2232)
R = 5.6 k
(for the LA2232M)
Bi-phase signal
ARI Decoder Application Circuit
No. 4416A-5/9
LA2232, 2232M
*R = 6.8 k
(for the LA2232)
R = 5.6 k
(for the LA2232M)
Unit (resistance:
, capacitance: F)
No. 4416A-6/9
LA2232, 2232M
For the LA2232, an input level of under 300 mVr ms on pin 6 is desirable for a 100% FM demodulation output.
We recommend the use of a pre-high pass filter as shown in the figure below if the 100% FM demodulation output level is over 300 mVr ms.
FM demodulation signal input
To the LA2232 pin 6
RDS-ID (LA2232), RECEIVE-ID (LC7073) Detection Time
(the RECEIVE-ID indicates synchronization completion).
No. 4416A-7/9
LA2232, 2232M
RDS Application IC Lineup
(1)
(2)
No. 4416A-8/9
LA2232, 2232M
No. 4416A-9/9
LA2232, 2232M
This catalog provides information as of July, 1997. Specifications and information herein are subject to change
without notice.
s
No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace
equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of
which may directly or indirectly cause injury, death or property loss.
s
Anyone purchasing any products described or contained herein for an above-mentioned use shall:
Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and
distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all
damages, cost and expenses associated with such use:
Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on
SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees
jointly or severally.
s
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for
volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied
regarding its use or any infringements of intellectual property rights or other rights of third parties.
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